Recent Studies On Boron Supplementation And Male Hormone Levels?
What recent studies show
The latest evidence suggests boron supplementation may influence male hormone markers in some small studies, but the human data are limited, mixed, and not strong enough to support boron as a reliable testosterone booster. The clearest signal comes from a small 2011 human trial reporting lower SHBG, higher free testosterone, and lower estradiol after short-term boron intake, while an older 1994 randomized study in male bodybuilders found no meaningful hormonal benefit from 2.5 mg/day for 7 weeks.
More recent review guidance from the NIH Office of Dietary Supplements notes that boron is not classified as an essential human nutrient, that adult intake patterns are usually around 1.0 to 1.5 mg/day total from food and supplements, and that the body absorbs roughly 85% to 90% of ingested boron.
Human studies on hormones
The best-known human study is the 2011 trial comparing daily and weekly boron dosing, which found that after one week of boron exposure free testosterone rose, estradiol fell, SHBG declined, and inflammatory markers also dropped. That study is often cited because it linked boron to both androgen and estrogen-related changes, but it was small and short-term, so it does not settle the question of whether boron meaningfully improves male hormone status in everyday life.
By contrast, the 1994 placebo-controlled study in male bodybuilders used 2.5 mg/day of boron for 7 weeks and found no significant effect on total testosterone, free testosterone, lean body mass, or strength beyond the training effect itself. Taken together, these two human studies point to a possible hormonal effect in specific settings, but not a consistent one.
Newer animal data
Animal research published more recently has renewed interest in the subject, especially work in male goats. In that study, 70 mg/kg dietary boron for 6 months increased serum testosterone over time and increased expression of CYP17A1, a gene involved in steroid production, while thyroid hormones stayed similar to controls.
Animal findings are useful for mechanism, but they do not automatically translate to human benefit. The goat study strengthens the biological plausibility of boron affecting steroidogenesis, yet it is not evidence that healthy men should expect a similar testosterone rise from supplements.
What the evidence means
The overall pattern is that boron may affect hormone metabolism, especially free testosterone, SHBG, and estradiol, but the evidence base is too small to treat it like a proven intervention. The NIH fact sheet specifically says boron has possible roles in steroid hormones and reproduction, but also emphasizes that human research has not identified a clear essential biological function.
A practical interpretation is that boron is a promising trace element, not a confirmed therapy. For men concerned about low testosterone, boron should not replace evaluation of sleep, resistance training, weight status, alcohol intake, medications, thyroid function, or underlying testicular or pituitary disorders.
Study snapshot
| Study | Population | Dose / Duration | Main hormone finding | Takeaway |
|---|---|---|---|---|
| Green & Ferrando, 1994 | 19 male bodybuilders | 2.5 mg/day, 7 weeks | No significant testosterone change attributable to boron | Did not support a testosterone-boosting effect |
| Naghii et al., 2011 | Small human sample | Daily or weekly boron, short-term | Free testosterone up, estradiol down, SHBG down | Suggestive but limited by size and duration |
| Male goat study, 2024-era publication | 12 male goats | 70 mg/kg diet, 6 months | Serum testosterone increased over time | Supports biological plausibility, not human proof |
Context and safety
The NIH fact sheet lists a World Health Organization safe adult intake range of 1 to 13 mg/day, and the U.S. Food and Nutrition Board set a tolerable upper intake level of 20 mg/day for adults. That matters because supplemental boron products can vary widely, and more is not automatically better for hormones.
Evidence also suggests boron intake is usually obtained from food, especially plant foods, nuts, legumes, fruit, and coffee, rather than from high-dose supplements. Since boron is not routinely measured in clinical practice, people often assume a hormone effect they cannot actually verify without proper testing.
Bottom line
Recent studies do not show a settled answer, but they do suggest that boron may modestly influence male hormone markers under some conditions, particularly free testosterone, SHBG, and estradiol, while the strongest human placebo-controlled evidence remains inconsistent. The most defensible conclusion is that boron is interesting, biologically plausible, and worth more research, but not yet a proven male hormone supplement.
"Boron might have beneficial effects on such functions as reproduction and development, calcium metabolism, bone formation, brain function, insulin and energy substrate metabolism, immunity, and the function of steroid hormones".
Practical takeaways
- Human evidence is small and mixed, with one short-term study suggesting improved free testosterone and one older trial showing no hormone benefit.
- Animal data support a possible mechanism, including effects on steroidogenesis genes such as CYP17A1.
- Adult boron intake is usually low in the diet, and the NIH cites 1 to 13 mg/day as a safe adult range, with 20 mg/day as the adult upper limit.
- For suspected low testosterone, formal medical evaluation is more reliable than self-experimenting with supplements.
How to read the evidence
- Check whether the study is in humans or animals, because animal hormone effects often do not match human results.
- Look at sample size and duration, because most boron studies are small and short.
- Separate total testosterone from free testosterone, since boron appears more likely to affect SHBG and free hormone fraction than total testosterone alone.
- Consider the context, because sleep, training, body fat, and illness can change hormone levels more than a trace supplement can.
Helpful tips and tricks for Recent Studies On Boron Supplementation And Male Hormone Levels
Does boron raise testosterone?
Possibly a little in some short-term studies, but the human evidence is inconsistent and not strong enough to call boron a reliable testosterone booster.
Does boron lower estrogen?
One small human study reported lower estradiol after boron supplementation, but that result needs replication before it can be treated as established.
What dose did studies use?
Human studies have used doses such as 2.5 mg/day for 7 weeks and about 10 mg/day in short-term protocols, while the goat study used 70 mg/kg diet.
Is boron safe for men?
At typical dietary and moderate supplemental levels, boron is generally considered to have a wide safety margin, but adults should stay within the NIH and FNB guidance unless a clinician advises otherwise.
Should men take boron for low testosterone?
Not as a first-line strategy, because the evidence is too limited and better-supported causes of low testosterone should be evaluated first.